Albbet schmtd



A. SCHMID,

SAFETY VALVE.

(No Model.)

No. 303,754. Patented Aug. 19. 1884.

not!" zar "UNITED STATES PATENT Orrlcn.

ALBERT SGHll/IID, OF ZURICH, SIVITZERLAND.

SAFETY-VA'LV E.

- SPECIFICATION forming part of Letters Patent No. 303,754, dated August 19, 1884. Application filed January 9,1884. (No model.) Patented in France May 4, 1883, No. 155,269.

10 (1. whom it may concern.-

Be it known that I, ALBERT ScnMID, a citizen of Switzerland, residing at Zurich, in the and exact description of the invention, such will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to the class of adjustable spring-pressed safety-valves; and the object of my invention is to diminish the amount of friction and to provide a safety-valve which will operate with the smallest excess of steampressure over the amount for which it is set.

The invention consists in the construction and arrangement of parts, as hereinafter described and claimed.

Figure 1 shows a vertical section, partly in side elevation, of a safetywalve embodying my invention; and Fig. 2 is a ground plan of the lower portion, partlyin section.

The ring, of bronze or other hard metal, a, forms the seat of the valve I), which rests freely on the crest of the ring a. The central pointed head 0 of the valve 1) fits into a cavity in the under side of the forked arm (I, the two arms of which are pivoted to one of the side standards, f, by means of screws with pivotpoints that rest in sockets in the side of the standard. 011 the upper side of the arm (I. there is a socket, which receives the central pivot-point of the plate 1', the same being imlnediately above the head 0 of the valve-plate. The spring 9 is confined between the two plates 'i and h, the latter forming a base-block for the regulating-screw K, and having a central socket which receives the end of the screw. The lower plate, i, has a pin, (indicated by the dotted lines in Fig. 1,) which extends up within the spiral spring almost to the top plate,

'7, to limit the upward movement of the valve.

The pressure on the valve is regulated and set by means of the screw K, and the head of the same'is covered by a cap, M, to prevent it .resisting friction or adherence to the seat at any point of its contactsurface, and to take an inclined or horizontal position, its point of p ressure forming at the time its only guide.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is-

1. In a safety-valve, a pivoted arm, in combination with the valve and a spring-pressed plate between which it is interposed, substantially as and for the purpose set forth.

2. A safety-valve consisting of avalve,b,having its seat on ring a, and central head, 0, pivoted forked arm (1, plate a, having its central pivot-point, spring 9, top plate,h, and regulat ing-screw K, combined and arranged substantially as set forth.

In testimony whereof I affix mysignature in presence of two witnesses.

ALBERT SGHMID.

\Vitnesses:

T. A. BOURRY, WILLIAM SCHNEIDER. 

